“ The situation would be as if the USPS didn’t exist, with UPS and FedEx refusing to go at all to 1/3 of the country’s households (declaring them too unprofitable to handle), routinely failing to deliver parcels on time or intact to the remaining 2/3s while pocketing a tidy profit. Part of the reason why these private alternatives are so good is the competition from the government-run program (mandated to provide service to 100% of households.)”
Source: slog.thestranger.com